Patent GB-833361-A (GB)
Title: Bleaching washing agents
IPC: C11D3/39
Filed: 1956-07-12
Abstract: A washing composition comprises (a) an anionic or non-ionic surface active agent, (b) a neutral or basic alkali-metal salt, or a water-soluble alkaline-earth metal salt, (c) an organic per-compound, and (d) an activator which is either the anhydride of a carboxylic acid having at most 8 carbon atoms or an organic halogen compound which can be converted by hydrolysis into a carboxylic acid, or a salt thereof, having at most 8 carbon atoms. Component (a), which preferably constitutes 1-75% by weight of the composition, is suitably an alkylbenzene sulphonate or an alkyl sulphate.  Component (b) includes sodium or magnesium sulphate and sodium carbonate, bicarbonate, phosphate and polyphosphates.  Component (c) is an hydroperoxide, peroxide, per-acid, per-acid ester or a diacyl peroxide, and a list of suitable compounds is given.  Per-compounds derived from carboxylic acids whose alkali metal salts have surface-active properties, or those derived from aromatic mono- or di-carboxylic acids having at most 10 carbon atoms, are particularly suitable. The content of per-compound should be such as to yield an active oxygen content of up to 3.5%, preferably 0.2-3%, by weight of the composition.  Component (d) is generally present in such an amount that the ratio of active oxygen to activator is in the range 6 : 1 to 1 : 6, and is suitably propionic or benzoic anhydride; benzoyl, chlorbenzoyl, or o-nitro-benzoyl chloride; isophthalic acid dichloride; benzotrichloride; or o-, m- or p-bis-tribromomethyl-benzene.  Stabilizers for (c), such as water-insoluble oxides, hydroxides, carbonates, silicates or soaps of alkaline-earth metals (including magnesium), tin, and aluminium may also be present.  Amides and alkanolamides of carboxylic or sulphonic acids, salts of polymeric carboxylic acids, glue, gelatin, salts of ether carboxylic or sulphonic acids of starch or cellulose, for example carboxymethyl cellulose, cellulose sulphate, sodium silicate with a ratio Na2O : SiO2 of 1 : 1 to 1 : 4, magnesium silicate with a ratio MgO : SiO2 of 1.5 : 1 to 1 : 4, dyestuffs, and brighteners may also be incorporated.  Specifications 431,682 and 822,901 are referred to.ALSO:A bleaching composition comprises (a) an anionic or non-ionic surface-active agent; (b) a neutral or basic alkali metal salt, or a water-soluble alkaline-earth metal salt; (c) an organic per-compound; and (d) an activator which is either the anhydride of a carboxylic acid having at most 8 carbon atoms or an organic halogen compound which can be converted by hydrolysis into a carboxylic acid, or a salt thereof, having at most 8 carbon atoms. Component (a), which preferably constitutes 1-75% by weight of the composition, is suitably an alkylbenzene sulphonate or an alkyl sulphate.  Component (b) includes sodium or magnesium sulphate and sodium carbonate, bicarbonate, phosphate and polyphosphates.  Component (c) is a hydroperoxide, peroxide, per-acid, per-acid ester or a diacyl peroxide, and a list of suitable compounds is given.  Per-compounds derived from carboxylic acids whose alkali metal salts have surface-active properties, or those derived from aromatic mono- or di-carboxylic acids having at most 10 carbon atoms, are particularly suitable. The content of per-compound should be such as to yield an active oxygen content of up to 3.5%, preferably 0.2-3%, by weight of the composition.  Component (d) is generally present in such an amount that the ratio of active oxygen to activator is in the range 6 : 1 to 1 : 6, and is suitably propionic or benzoic anhydride; benzoyl, chlorbenzoyl, or o-nitro-benzoyl chloride; isophthalic acid dichloride; benzotrichloride; or o-, m- or p-bis-tribromomethylbenzene.  Stabilizers for (c), such as water-insoluble oxides, hydroxides carbonates, silicates or soaps of alkaline-earth metals (including magnesium), tin, and aluminium may also be present.  Amides and alkanolamides of carboxylic or sulphonic acids, salts of polymeric carboxylic acids, glue, gelatin, salts of ether carboxylic or sulphonic acids of starch or cellulose, for example carboxymethyl cellulose, cellulose sulphate, sodium silicate with a ratio Na2O : SiO2 of 1 : 1 to 1 : 4, magnesium silicate with a ratio MgO : SiO2 of 1.5 : 1 to 1 : 4, dyestuffs, and brighteners may also be incorporated.  The compositions are particularly suitable for washing and bleaching materials of natural or artificial cellulose, nettle cloth, or linen at temperatures above 45 DEG  C. Specification 431,682 and 822,901 are referred to.